From: lkcl <lkcl@web>
Date: Sun, 12 Jun 2022 06:44:39 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls005_v1~1838
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c719ac359d0a6249a2461a560ed7880858335e49;p=libreriscv.git

---

diff --git a/openpower/sv/mv.swizzle.mdwn b/openpower/sv/mv.swizzle.mdwn
index 40d0758f3..8a5305870 100644
--- a/openpower/sv/mv.swizzle.mdwn
+++ b/openpower/sv/mv.swizzle.mdwn
@@ -65,19 +65,17 @@ quantities as the default is lifted on `sv.mv.swiz`.
 |PO   | RTp| RSp |imm  | 0011| mv.swiz      |
 |PO   | RTp| RSp |imm  | 1011| fmv.swiz     |
 
-this gives a 12 bit immediate across bits 16 to 25 and 29-30.
+this gives a 12 bit immediate across bits 16 to 27.
+Each swizzle mnemonic (XYZW), commonly known from 3D GPU programming,
+has an associated index.  3 bits of the immediate are allocated
+to each:
 
-* 3 bits X
-* 3 bits Y
-* 3 bits Z
-* 3 bits W
-
-| bits | 0.2 |3.5 |6.8|9.11|
-|------|-----|----|---|----|
+| imm   |0.2 |3.5 |6.8|9.11|
+|-------|----|----|---|----|
 |swizzle|X   | Y  | Z | W  |
 |index  |0   | 1  | 2 | 3  |
 
-the options are:
+the options for each Swizzle are:
 
 * 0b000 to indicate "skip".  this is equivalent to predicate masking
 * 0b001 is not needed (reserved)